There’s lots of great uses for QR codes – none of them involve replacing URI, which unfortunately is what marketing firms decided to make them infamous for. Using them to add a contact, “Like” a Facebook page, launch phone calls, etc.

Fryderyk: the problem with that trick is that it only works with QR readers that fully support vcard/icard, of which there are effectively zero. I’ve given up and just have a short link to my vcard (http://foo.bar/me.vcard) on the card itself.